LIEBHERR 10349214 HS825 Crane Track Idler Wheel Assy / Heavy duty construction machinery parts manufacturer-HAN GONG MACHINERY MANUFACTURING LTD.,(DPW PARTS)

Product Specifications

 LIEBHERR 10349214 HS825 Crane Track Idler Wheel Assembly – Manufactured by HAN GONG MACHINERY MANUFACTURING LTD. (DPW PARTS)

1. Component Identification & System Function

The Track Idler Wheel Assembly (OEM Part Number: 10349214) is a critical structural and functional component of the crawler undercarriage system for the LIEBHERR HS825 heavy-duty duty-cycle crane or similar heavy-lift crawler crane models. As a first-tier manufacturer, HAN GONG MACHINERY MANUFACTURING LTD. (commercially branded as DPW PARTS) produces this assembly as a precision-engineered, direct replacement part. Positioned at the forward end of the track frame, the idler serves as the primary non-driven sprocket, providing definitive track chain guidance, tension regulation, and load support for the machine's travel and static stability functions.

2. Primary Operational Role & Design Intent

In the context of a heavy-duty crane like the LIEBHERR HS825, the idler assembly fulfills several mission-critical roles:

• Track Chain Guidance & Alignment: It establishes the precise forward path for the track chain's links and bushings, ensuring perfect alignment as the chain engages with the sprocket and traverses the upper carriage, thereby preventing derailment under high side-load conditions during lifting operations and travel on uneven ground.

• Track Tension Control: The assembly is integrated with the track frame's hydraulic or screw-type tensioning mechanism. It acts as the thrust-bearing point to apply and maintain optimal track chain tension, which is paramount for eliminating excessive chain slap, minimizing power loss during travel, and ensuring uniform load distribution across all undercarriage components.

• Impact Load Absorption & Distribution: It is engineered to absorb the initial vertical and horizontal shock loads as the track chain rolls onto the undercarriage, especially critical for cranes frequently traveling on job sites with unprepared surfaces. This protects the track frame, rollers, and final drive from premature fatigue failure.

• Structural Gauge Reference Point: As the foremost fixed point on the track frame, it defines and maintains the critical track gauge, a key determinant of machine stability, counter-rotation capability, and overall ground pressure distribution.

3. Detailed Construction & Engineering Specifications (HAN GONG/DPW PARTS Standard)

The assembly from HAN GONG MACHINERY is manufactured to meet or exceed the rigorous demands of LIEBHERR's original specifications:

• Idler Wheel/Rim Fabrication:

  • Material: Forged from high-tensile, fine-grained alloy steel (e.g., 42CrMo, 50Mn), selected for its superior strength-to-weight ratio and fatigue resistance.

  • Heat Treatment: The running surface undergoes a specialized case hardening (carburizing or carbonitriding) process, followed by precision grinding. This results in an extremely hard, wear-resistant outer case (HRC 58-62) fused to a tough, ductile core capable of withstanding immense impact without brittle fracture.

  • Machining: CNC-controlled turning and grinding ensure concentricity, precise flange dimensions, and perfect surface finish for smooth track bushing interaction.

• Shaft & Hub Assembly:

  • The integral shaft is manufactured from quenched and tempered alloy steel, with bearing journals induction-hardened and precision-ground to achieve optimal surface finish (Ra < 0.8 µm) for maximum bearing life.

  • The flange hub is often a monolithic forging with the shaft or is welded using submerged arc welding (SAW) with post-weld heat treatment (PWHT) to relieve stresses.

• Bearing & Sealing System:

  • Bearing: Utilizes a matched set of large-bore, premium-grade Tapered Roller Bearings (Timken-style). These are pre-adjusted for optimal preload and selected for their exceptional capacity to handle the combined high radial loads from crane weight and severe axial thrust loads encountered during slewing and travel on slopes.

  • Sealing: A multi-barrier, cartridge-type sealing system is employed. This typically combines a radial lip seal, a floating face seal, and an external grease-purged labyrinth seal. The cavity is filled with high-adhesion, polymer-enhanced extreme pressure (EP) grease designed for wide temperature ranges and high moisture resistance, providing long-term protection in contaminated environments.

• Mounting Interface & Wear Components:

  • The assembly interfaces with the track frame via hardened and ground wear plates or replaceable saddle bushings, often made from through-hardened steel or bronze composite materials. These are designed as sacrificial components to simplify future maintenance and protect the main frame structure.

• Lubrication: Equipped with standard metric threaded grease fittings for periodic re-lubrication of the main bearing cavity, following OEM-recommended service intervals.

4. Manufacturer Profile: HAN GONG MACHINERY MANUFACTURING LTD. (DPW PARTS)

HAN GONG MACHINERY, operating under the DPW PARTS brand, is a specialized heavy industrial manufacturer focused on undercarriage and chassis components for construction, mining, and crane machinery.

• Core Competency: Vertical integration in the manufacturing of large, forged, and heavily machined wear parts.

• Manufacturing Philosophy: Focuses on material science, precision machining, and robust sealing solutions to deliver components with extended service life in severe-duty cycles.

• Quality Assurance: Implements a full quality management system, typically ISO 9001 certified. Production involves:

  • Spectroscopic material analysis.

  • Ultrasonic testing (UT) of forgings for internal defects.

  • In-process dimensional checks via CMM for critical features.

  • Final assembly testing for rotational smoothness and seal integrity.

• Market Position: Positions itself as a quality-aftermarket and direct-supply manufacturer, offering a reliable alternative to OEM parts by balancing performance, durability, and cost-effectiveness.

5. Application Notes, Maintenance & Compatibility

• Primary Application: LIEBHERR HS825 Crawler Crane.

• Interchangeability: Engineered as a direct replacement for Liebherr part number :10349214. Verification against the machine's serial number and existing component dimensions is always recommended prior to procurement to account for any factory revisions.

• Wear Monitoring & Service Life: Key wear indicators include:

  • Reduction in the idler wheel's outside diameter.

  • Thinning of the guidance flanges.

  • Increased lateral play in the assembly (indicative of bushing or bearing wear).

• Preventive Maintenance: Regular cleaning of accumulated debris around the idler and tensioning mechanism, coupled with scheduled re-lubrication, is crucial for maximizing component life. Track tension must be maintained per OEM specifications to prevent undue stress on the idler bearings and bushings.

• System-Wide Considerations: For optimal performance and undercarriage economy, the idler's condition should be evaluated as part of the complete track system—track chain (pins/bushings), sprocket (rims), and lower rollers—to avoid accelerated wear on new components.